Refrigerator



FIG. 1 is a front perspective view of the first embodiment of a refrigerator showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational view thereof, the right side elevational view being a mirror image; and,

FIG. 4 is a top plan view thereof.

The broken lines shown in the drawing disclosure are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a refrigerator, as shown and described. 